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ν Aquarii
Nu Aquarii is a star in the equatorial constellation of Aquarius. The name is a Bayer designation that is Latinized from ν Aquarii, and abbreviated Nu Aqr or ν Aqr. With an apparent visual magnitude of 4.52, Nu Aquarii is faintly visible to the naked eye. Its distance from Earth, as determined from parallax measurements, is . The star is drifting closer to the Sun with a radial velocity of −11 km/s. At an estimated age of 708 million years, Nu Aquarii has exhausted the supply of hydrogen at its core and evolved into a giant star with a spectrum that matches a stellar classification of G8 III. It has double the mass of the Sun and has expanded to eight times the Sun's radius. Nu Aquarii is radiating 37 times the luminosity of the Sun from its photosphere at an effective temperature of . At this heat, the star is glowing with the yellowish hue of a G-type star. Together with μ Aquarii, it is Albulaan , a name derived from the Arabic term ''al-bulaʽ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aquarius (constellation)
Aquarius is an celestial equator, equatorial constellation of the zodiac, between Capricornus and Pisces (constellation), Pisces. Its name is Latin for "water-carrier" or "cup-carrier", and its old astronomical symbol is (♒︎), a representation of water. Aquarius is one of the oldest of the recognized constellations along the zodiac (the Sun's apparent path). It was one of the 48 constellations listed by the 2nd century astronomer Ptolemy, and it remains one of the IAU designated constellations, 88 modern constellations. It is found in a region often called the Sea (astronomy), Sea due to its profusion of constellations with watery associations such as Cetus the whale, Pisces the fish, and Eridanus (constellation), Eridanus the river. At apparent magnitude 2.9, Beta Aquarii is the brightest star in the constellation. History and mythology Aquarius is identified as "The Great One" in the Babylonian star catalogues and represents the god Ea (god), Ea himself, who is commonl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Luminosity Of The Sun
The solar luminosity () is a unit of radiant flux ( power emitted in the form of photons) conventionally used by astronomers to measure the luminosity of stars, galaxies and other celestial objects in terms of the output of the Sun. One nominal solar luminosity is defined by the International Astronomical Union to be . This corresponds almost exactly to a bolometric absolute magnitude of +4.74. The Sun is a weakly variable star, and its actual luminosity therefore fluctuates. The major fluctuation is the eleven-year solar cycle (sunspot cycle) that causes a quasi-periodic variation of about ±0.1%. Other variations over the last 200–300 years are thought to be much smaller than this. Determination Solar luminosity is related to solar irradiance (the solar constant). Slow changes in the axial tilt of the planet and the shape of its orbit cause cyclical changes to the solar irradiance. The result is orbital forcing that causes the Milankovitch cycles, which determine Earthl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
47 Capricorni
47 Capricorni is a variable star located around 1,170 light years from the Sun in the southern constellation Capricornus, near the northern border with Aquarius. It has the variable star designation of AG Capricorni and a Bayer designation of c2 Capricorni; ''47 Capricorni'' is the ''Flamsteed designation''. This object is visible to the naked eye as a dim, red-hued point of light with an apparent visual magnitude that varies between 5.90 and 6.14. The star is receding from the Earth with a heliocentric radial velocity of +20 km/s. In 1963, Alan William James Cousins announced that 47 Capricorni is a variable star. It was given its variable star designation in 1973. This is an aging red giant star with a stellar classification of M2III. It is a semiregular variable star of subtype SRb with a period of 30.592 days and a maximum brightness of 5.9 magnitude. With the supply of hydrogen at its core exhausted, the star has expanded to around 102 times the Sun' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
46 Capricorni
46 Capricorni is a solitary star located around 790 light years away from the Sun in the southern constellation of Capricornus, near the northern border with Aquarius. It is visible to the naked eye as a dim, yellow-hued point of light with an apparent visual magnitude of +5.10. 46 Cap is also known by its Bayer designation of c Capricorni (c Cap), and occasionally as c1 Capricorni to distinguish it from the nearby star c2 Capricorni. It is moving closer to the Earth with a heliocentric radial velocity of −15.5 km/s. This star has received a stellar classification of G8Iab, which suggests it is a G-type supergiant star, as well as G7.5II-IIICN0.5, which instead indicates a luminosity class between a giant and a bright giant. Abundance analysis suggests the star has not yet passed the first dredge-up. It has 4.6 times the mass of the Sun and has expanded to 33 times the Sun's radius. The star is radiating 627 times the luminosity of the Sun from its photosph ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ξ Aquarii
Xi Aquarii is a binary star system in the celestial equator, equatorial constellation of Aquarius (constellation), Aquarius. Its name is a Bayer designation that is Romanization of Greek, Latinized from ξ Aquarii, and abbreviated Xi Aqr or ξ Aqr. The system is visible to the naked eye as a point of light with an apparent visual magnitude of 4.7. The two components are designated Xi Aquarii A (also named Bunda) and B. Based upon stellar parallax, parallax measurements, this system lies at a distance of approximately from the Sun. It is drifting closer with a heliocentric radial velocity of –26 km/s. The position of this system near the ecliptic means it is subject to lunar occultation. Xi Aquarii is a single-lined spectroscopic binary system, which means that the presence of an unseen orbiting companion can be inferred from Doppler shifts in the spectral absorption lines. The two bodies orbit each other with a orbital period, period of 8,016 days (22 y ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Emptiness (Chinese Constellation)
The Emptiness mansion () is one of the Twenty-eight mansions of the Chinese constellations. It is one of the northern mansions of the Black Tortoise (Chinese constellation), Black Tortoise. Asterisms References {{DEFAULTSORT:Emptiness (Chinese Constellation) Chinese constellations ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chinese Astronomy
Astronomy in China has a long history stretching from the Shang dynasty, being refined over a period of more than 3,000 years. The Ancient China, ancient Chinese people have identified stars from 1300 BCE, as Chinese star names later categorized in the twenty-eight mansions have been found on oracle bones unearthed at Anyang, dating back to the mid-Shang dynasty. The core of the "mansion" (宿 ''xiù'') system also took shape around this period, by the time of King Wu Ding (1250–1192 BCE). Detailed records of astronomical observations began during the Warring States period (fourth century BCE). They flourished during the Han period (202 BCE – 220 CE) and subsequent dynasties with the publication of star catalogues. Chinese astronomy was equatorial, centered on close observation of circumpolar stars, and was based on different principles from those in traditional Western astronomy, where heliacal risings and settings of zodiac constellations formed the basic ecliptic framew ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
μ Aqr
Mu Aquarii is the for a binary star system in the equatorial constellation of Aquarius. Its name is a Bayer designation that is Latinized from μ Aquarii, and abbreviated Mu Aqr or μ Aqr. The star is visible to the naked eye with a combined apparent visual magnitude of 4.7. Based upon parallax measurements, the distance to this system is about . It is drifting closer to the Sun with a radial velocity of −9.1 km/s. This star was tentatively identified as a single-lined spectroscopic binary by Helmut A. Abt in 1961. It has an orbital period of and an eccentricity (ovalness) of 0.23. The pair have been resolved by speckle interferometry, showing an angular separation of . The visible spectrum matches a stellar classification of A3m, with the 'm' suffix indicating that this is an Am, or chemically peculiar star. A 2020 classification of , indicates ionized calcium (k) lines match a class of A4, hydrogen lines (h) a class of F1, and metal lines (m) F3. There ar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ε Aqr
Epsilon Aquarii is a binary star system in the equatorial zodiac constellation of Aquarius, located near the western constellation border with Capricornus. Its identifier is a Bayer designation that is Latinized from ε Aquarii, and abbreviated Eps Aqr or ε Aqr, respectively. It has the proper name Albali , now formally recognized by the IAU. This system is visible to the naked eye as a point of light with an apparent visual magnitude of 3.77, and has an absolute magnitude of −0.46. Based upon parallax measurements taken by the Gaia spacecraft, it is located at a distance of approximately from Earth. The star is drifting closer with a radial velocity of −20 km/s. Properties The primary member has a stellar classification of A1 V, indicating it is an A-type main-sequence star. However, isochrone fitting suggests this star has recently evolved away from the main sequence and is now a subgiant star. It is estimated to be 388 million years old with ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arabic
Arabic (, , or , ) is a Central Semitic languages, Central Semitic language of the Afroasiatic languages, Afroasiatic language family spoken primarily in the Arab world. The International Organization for Standardization (ISO) assigns language codes to 32 varieties of Arabic, including its standard form of Literary Arabic, known as Modern Standard Arabic, which is derived from Classical Arabic. This distinction exists primarily among Western linguists; Arabic speakers themselves generally do not distinguish between Modern Standard Arabic and Classical Arabic, but rather refer to both as ( "the eloquent Arabic") or simply ' (). Arabic is the List of languages by the number of countries in which they are recognized as an official language, third most widespread official language after English and French, one of six official languages of the United Nations, and the Sacred language, liturgical language of Islam. Arabic is widely taught in schools and universities around the wo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Albulaan term, ''al-bulaʽān'' (ألبولعان) meaning "the two swallowers".
{{Set index article , astronomical objects ...
The traditional star name Albulaan refers to two stars in the Aquarius constellation: * μ Aquarii * ν Aquarii The name derives from the Arabic Arabic (, , or , ) is a Central Semitic languages, Central Semitic language of the Afroasiatic languages, Afroasiatic language family spoken primarily in the Arab world. The International Organization for Standardization (ISO) assigns lang ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
μ Aquarii
Mu Aquarii is the for a binary star system in the equatorial constellation of Aquarius. Its name is a Bayer designation that is Latinized from μ Aquarii, and abbreviated Mu Aqr or μ Aqr. The star is visible to the naked eye with a combined apparent visual magnitude of 4.7. Based upon parallax measurements, the distance to this system is about . It is drifting closer to the Sun with a radial velocity of −9.1 km/s. This star was tentatively identified as a single-lined spectroscopic binary by Helmut A. Abt in 1961. It has an orbital period of and an eccentricity (ovalness) of 0.23. The pair have been resolved by speckle interferometry, showing an angular separation of . The visible spectrum matches a stellar classification of A3m, with the 'm' suffix indicating that this is an Am, or chemically peculiar star. A 2020 classification of , indicates ionized calcium (k) lines match a class of A4, hydrogen lines (h) a class of F1, and metal lines (m) F3. There ar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
